Taran tactical extended mag kit 40 S&W using in M&P Pro. I got what I thought was the extended extra power springs but having problems feeding. Using Berrys 180 pfp seated to 1.125 and getting jams where the bullet is nosediving on the feedramp. Failing to feed, pulling slide back then bullet will start on the ramp and will feed. Seems like not enough spring pressure on the cartridge to push it up far enough.
Comparing the TTI springs to the original S&W mag springs looks like they are the same length.
Did I get the correct springs from TTI?
Any suggestions?